Figure 3.

Adjusted daily percent absent among elementary/middle school and high school students in the New York City school system for the 2002–03 school year, adjusted for day-of-week and clerical days. Plotted against Emergency Department visits for fever and flu-like illness among children age 5–17 and the number of influenza A and influenza B isolates identified at three World Health Organization reference virology laboratories in New York City.